Spin correlations in the S = 1 armchair chain Ni₂NbBO₆ as seen from NMR

【摘要】 We report our nuclear magnetic resonance（NMR） study on the structurally spin chain compound Ni₂ NbBO₆ with complex magnetic coupling.The antiferromagnetic transition is monitored by the line splitting resulting from the staggered internal hyperfine field.The magnetic coupling configuration proposed by the first-principle density functional theory（DFT） is supported by NMR spectral analysis.For the spin dynamics,a prominent peak at T～35 K well above the Neel temperature（T_N～20 K at μ₀ H=10 T） is observed from the spin-lattice relaxation data.As compared with the dc-susceptibility,this behavior indicates an antiferromagnetic coupling with the typical energy scale of ～3 meV.Thus,the Ni₂ NbBO₆ compound can be viewed as strongly ferromagnetically coupled armchair spin chains along the crystalline b-axis.These facts place strong constraints on the theoretical model for this compound.更多还原

【Abstract】 We report our nuclear magnetic resonance（NMR） study on the structurally spin chain compound Ni₂ NbBO₆ with complex magnetic coupling.The antiferromagnetic transition is monitored by the line splitting resulting from the staggered internal hyperfine field.The magnetic coupling configuration proposed by the first-principle density functional theory（DFT） is supported by NMR spectral analysis.For the spin dynamics,a prominent peak at T～35 K well above the Neel temperature（T_N～20 K at μ₀ H=10 T） is observed from the spin-lattice relaxation data.As compared with the dc-susceptibility,this behavior indicates an antiferromagnetic coupling with the typical energy scale of ～3 meV.Thus,the Ni₂ NbBO₆ compound can be viewed as strongly ferromagnetically coupled armchair spin chains along the crystalline b-axis.These facts place strong constraints on the theoretical model for this compound.更多还原